nl80211: AP MLD support for adding multi link stations

Multi link stations are represented in the kernel using a single
station with multiple links and the first ADD_STA command also
creates the first link. Subsequent links should be added with
LINK_ADD commands.

Implement this logic and provide the required MLD information per
station/link.

Signed-off-by: Andrei Otcheretianski <andrei.otcheretianski@intel.com>

src/ap/ap_drv_ops.c

@@ -459,6 +459,7 @@ int hostapd_sta_add(struct hostapd_data *hapd,
 	params.qosinfo = qosinfo;
 	params.support_p2p_ps = supp_p2p_ps;
 	params.set = set;
+	params.mld_link_id = -1;
 	return hapd->driver->sta_add(hapd->drv_priv, &params);
 }